From patchwork Fri Mar 18 11:17:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miaohe Lin X-Patchwork-Id: 12784165 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id A21C2C433F5 for ; Thu, 17 Mar 2022 14:42:01 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 1037B8D0005; Thu, 17 Mar 2022 10:42:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0BACF6B0073; Thu, 17 Mar 2022 10:42:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E952D8D0005; Thu, 17 Mar 2022 10:41:59 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay.hostedemail.com [64.99.140.26]) by kanga.kvack.org (Postfix) with ESMTP id C9D4A6B0072 for ; Thu, 17 Mar 2022 10:41:59 -0400 (EDT) Received: from smtpin07.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 9FBE124E60 for ; Thu, 17 Mar 2022 14:41:59 +0000 (UTC) X-FDA: 79254142758.07.7BD382F Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by imf19.hostedemail.com (Postfix) with ESMTP id F36C31A0023 for ; Thu, 17 Mar 2022 14:41:58 +0000 (UTC) Received: from canpemm500002.china.huawei.com (unknown [172.30.72.53]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4KK8tY4ZsCzCqj8; Thu, 17 Mar 2022 22:39:49 +0800 (CST) Received: from huawei.com (10.175.124.27) by canpemm500002.china.huawei.com (7.192.104.244) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.21; Thu, 17 Mar 2022 22:41:51 +0800 From: Miaohe Lin To: CC: , , , , , , , Subject: [PATCH v2 07/11] mm/migration: avoid unneeded nodemask_t initialization Date: Fri, 18 Mar 2022 19:17:05 +0800 Message-ID: <20220318111709.60311-8-linmiaohe@huawei.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20220318111709.60311-1-linmiaohe@huawei.com> References: <20220318111709.60311-1-linmiaohe@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.124.27] X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To canpemm500002.china.huawei.com (7.192.104.244) X-CFilter-Loop: Reflected X-Rspamd-Queue-Id: F36C31A0023 X-Stat-Signature: uxzuqo5djs3s1tdu5phf7i19rfugon7s X-Rspam-User: Authentication-Results: imf19.hostedemail.com; dkim=none; dmarc=pass (policy=quarantine) header.from=huawei.com; spf=pass (imf19.hostedemail.com: domain of linmiaohe@huawei.com designates 45.249.212.188 as permitted sender) smtp.mailfrom=linmiaohe@huawei.com X-Rspamd-Server: rspam02 X-HE-Tag: 1647528118-186178 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Avoid unneeded next_pass and this_pass initialization as they're always set before using to save possible cpu cycles when there are plenty of nodes in the system. Signed-off-by: Miaohe Lin Reviewed-by: Muchun Song Reviewed-by: Baolin Wang --- mm/migrate.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/migrate.c b/mm/migrate.c index 92068d090db8..bb36f6b40f18 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2379,8 +2379,8 @@ static int establish_migrate_target(int node, nodemask_t *used, */ static void __set_migration_target_nodes(void) { - nodemask_t next_pass = NODE_MASK_NONE; - nodemask_t this_pass = NODE_MASK_NONE; + nodemask_t next_pass; + nodemask_t this_pass; nodemask_t used_targets = NODE_MASK_NONE; int node, best_distance;